Thanks for the suggestion. I noticed on the Nikon site that their tubes specifically say that they don't work with G lenses (which this one is). Wonder what that's all about. I'll check with B&H about the Kenko Tubes. Doesn't depth of field go down to just about nothing when you focus very close with any lens. I know it's paper thin when I go down to 6 inches with the 18-55 kit lens. Other than the fact that it isn't macro, I like the lens; it's FAST and sharp. I got some nice pix on Christmas day with it.